This is the release notes of Firefox 3.6.6
Known IssuesThis list covers some of the known problems with Firefox 3.6, which will be resolved in future releases:
All Systems
If FIPS mode is enabled and certain files have been removed from the system, the browser may crash on startup (see bug 522041)
Microsoft Windows
Content over certain Flash videos may not disappear when the video plays (see bug 571313)
Older Flash videos on Download.com may fail to play. CNet has been notified of the issue (see bug 569104)
Some slower machines may see degraded mouse responsiveness when viewing certain Flash videos (see bug 561818)
Linux and Unix
Firefox may have difficulty playing system sounds in some distributions of Linux (see bug 536996)
Zooming out on some sites may result in grey or black lines appearing (see bug 468496)
@ HPY
I guess you can post a bug on
https://bugzilla.mozilla.org/OR
check out with Mozilla forum
http://forums.mozillazine.org/